Improvement in slide-valves



UNITED STATES PATENT FFICE.

HENRY SPENGLER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SLIDE-VALVES.

Specification forming part of Letters Patent No. 50,7116, dated October 31, 1865.

To all whom fit may concern-C Be it known that I, HENRY SPENGLER, ot the city ofPhiladelphia, in the county of Philadelphia and State ot' Pennsylvania, have invented certain new and useful Improvements in Balanced Slide-Valves for Steam-Engines; and I do now declare that the followingis an exact description thereof, reference being had to the annexed drawings, making a part of this specification.

In the drawings, the same letters refer to identical parts.

Figure l is a transverse section made near the valve-stem. Fig. 2 is a longitudinal section made through the center. Fig. 3 is a plan view with part ot' the cover of the steam-chest. Fig. et is an enlarged section, vshowing the packing or joint in the valve.

The nature of my improvement consists in constructing the valves of steam-engines .of four sides open through the middle, affording a free passage for the steam through the valve, the perpendicular sides of the valve being Iltted accurately upon their edges above and below to the top and bottom of the steam-chest, and made steam-tight and kept, under all circumstances, in perfect adjustment by the eX- pansion and contraction of au elastic metallic spring, inserted in and composing a part ot' the body of the valve, and having opposite to the .port a shallow supplementary port in the steam-chest bonnet, which, in connection with the cored portion ot the valve, permits the free passage of the steam equally above and below the valve when open, by means of which arrangement the pressure of the steam against the valve is made. equal from all directions, and creates no friction in its movements, the valve being perfectly balanced, and by the introduction of the steam through an opening below and another above ot' the same area, in consequence ot' the cored opening through the valve, it is only necessary to move the valve one-half otl the width ot' the port to secure a full opening.

To enable others skilled in the art to make and use my invention, I will proceed to eX- plain its construction and operation.

I construct the steam-chest in the ordinary manner. In large engines I recommend the location of the cylinder-ports at the extremil ties of the cylinder. This steam-chest is covered with a bonnet, C. In this bonnet are cast the supplementary ports K, which are charnbered recesses opposite to and ot' the same shape and size ot' area as the main ports, and of a depth not less than halt' the width ofthe port.

A A is the valve. This is cast in two similar parts, cored so as to lea-ve such partitions as may be necessary to give lateral support to the sides. The valve is made with four quadrilateral sides, and open above and below through the center, and is finished upon its upper and lower surfaces to worl;r on corresponding surfaces on the steam-chest. These two parts are united by the metallic spring j, composed cfa sheet of any elastic metal formed to the shape shown in the drawings, and attached to the two parts of the valve above and below by any ot' thc lapproved methods ot making a steam-joint.

The valves are attached and operated as other slide-valves.

In the construction ot the elastic jointj it is necessary to provide for sufficient torce to al ways maintain asteani-tightjoint between the bearing-surfaces of the valve and the valveseats upon the steam-chest. This may be done either by the elasticity of' the metal composing the joint or by so altering its shape as to add to the elasticity of the metal the foreeof the pressure of the steam upon the joint.

The action and direction ot' the steam passin Fig. 1.

Having fully explained the nature and operation of my invention, I do not claim my invention the mere interposition ot' a yielding substance or .packing between two similar valve-faces working between parallel surfaces; nor do I claim simply ports through a valve, for such are much used where cut-offs are employed nor do I claim a mere duplicate valveseat in connection with a slide-valve having ports and faces on both sides; but

What I claim as my invention, and seek to secure by Letters Patent, is-

1. The within-described valve, when so arranged as to permit the steam to pass to the cylinder around its upper and lower edges, by which arrangement a full area of opening ing from the port F is indicated by the arrows` is made by slightly-more than one-half the m0- tiou usually given to such valves, substantially as described.

2. The combination of the ports iu the valve A with the port F and supplementary port K, substantially as and for the purpose set forth.

3. Arranging the Withiudescribed valves between two parallel seats when such seats are duplicates the one of the other, substantielly as shown and described.

HENRY SPENGLER.

Witnesses:

JOHN S. HOLLINGSHEAD, CHAs. SIKKEN. A: 

